linux-kernel - Re: [PATCH v2 3/3] arm64: dts: qcom: Collapse usb support into one node

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Date:   Thu, 17 Aug 2017 14:43:49 +0800
From:   Shawn Guo <shawnguo@...nel.org>
To:     Stephen Boyd <stephen.boyd@...aro.org>
Cc:     Andy Gross <andy.gross@...aro.org>, linux-usb@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        devicetree@...r.infradead.org, Rob Herring <robh+dt@...nel.org>,
        Rob Clark <robdclark@...il.com>,
        Peter Chen <Peter.Chen@....com>
Subject: Re: [PATCH v2 3/3] arm64: dts: qcom: Collapse usb support into one
 node

Hi Stephen,

On Fri, Jul 14, 2017 at 02:40:05PM -0700, Stephen Boyd wrote:
> We currently have three device nodes for the same USB hardware
> block, as evident by the reuse of the same reg address multiple
> times. Now that the chipidea driver fully supports OTG with the
> MSM wrapper we can collapse all these nodes into one USB device
> node, reflecting the true nature of the hardware.
> 
> Signed-off-by: Stephen Boyd <stephen.boyd@...aro.org>
> ---
>  arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi | 38 ++++++++++---------
>  arch/arm64/boot/dts/qcom/msm8916.dtsi     | 62 +++++++++++++++----------------
>  2 files changed, 50 insertions(+), 50 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> index f326f4fb4d72..494560a1a6ef 100644
> --- a/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> +++ b/arch/arm64/boot/dts/qcom/apq8016-sbc.dtsi
> @@ -213,24 +213,20 @@
>  		};
>  
>  		usb@...9000 {
> -			extcon = <&usb_id>, <&usb_id>;
> +			extcon = <&usb_id>;

I'm trying to play the series on db410c, and it doesn't seem to work as
expected.  Here is basically what I did:

- Revert ed75d6a96905, and apply the series.
- Turn on the following options:
	CONFIG_USB_CHIPIDEA_ULPI
	CONFIG_USB_ULPI_BUS
	CONFIG_PHY_QCOM_USB_HS
	CONFIG_MUX_GPIO

The role switching doesn't happen when I connect/disconnect cable
to/from micro-usb port.  But if I revert above extcon change (keep two
usb_id phandle for extcon), the role switching happens.  However, host
driver still fails to enumerate the usb mouse attached to Type-A port.

[   15.400074] ci_hdrc ci_hdrc.0: EHCI Host Controller
[   15.400119] ci_hdrc ci_hdrc.0: new USB bus registered, assigned bus number 1
[   15.419847] ci_hdrc ci_hdrc.0: USB 2.0 started, EHCI 1.00
[   15.420700] hub 1-0:1.0: USB hub found
[   15.425820] hub 1-0:1.0: 1 port detected
[   15.759862] usb 1-1: new high-speed USB device number 2 using ci_hdrc
[   31.943942] usb 1-1: device not accepting address 2, error -110
[   32.063938] usb 1-1: new high-speed USB device number 3 using ci_hdrc
[   48.071943] usb 1-1: device not accepting address 3, error -110
[   48.191935] usb 1-1: new high-speed USB device number 4 using ci_hdrc
[   58.823934] usb 1-1: device not accepting address 4, error -110
[   58.943936] usb 1-1: new high-speed USB device number 5 using ci_hdrc
[   69.575935] usb 1-1: device not accepting address 5, error -110
[   69.576001] usb usb1-port1: unable to enumerate USB device

I must have missed something.  Can you please advice?  Thanks.

Shawn